Lifting mechanism



A. F. KLASING.

LIFTING MECHANISMF APPLICATION FILED oqT. 28, 1919.'

Patented June 20, 1 922...

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.i I 5 M 1 w A. F. KLASING.

LIFTING MECHANISM. APPLICATION FILED OCT. 28, 1919.

1,420,556. Patented June 20,1922.

2 SHEETS-SHEET 2- AUGUSTUS F. KIIASING', OF CHICAGO, ILLINOI S, ASSIGNOR TO THE KLASING GAR BRAKE COMPANY, A CORPORATION OF COLORADO.

LIFTING MECHANISM.

Specification of Letters Patent. Patented June 1922 Application filed October 28, 1919. Serial No. 333,978.

manually applying power to a longitudinally movable member, especially to a vertical, or substantially vertically arranged member which has to be raised against con-- siderable resistance. The invention contemplates providing the longitudinally -movable member with a rack and raising the same by means of a floating pinion which meshes with said rack and with a stationary rack parallel therewith.

One of the objects of the invention is to provide novel and improved means for rotating and raising the pinion intermittently so as to lift the longitudinally movable member step by step. Another object is to provide improved means for holding the longitudinally movable member in its raised position, which means may be set to release said member and will be automatically reset to its operative condition when said member is returned to its initial position.

A further object is to provide a suitable housing for the mechanism.

The invention consists in the novel arrangements, constructions and devices, to be hereinafter described, for carrying out the above stated objects, and such other objects as will appear from thefollowing description of a preferred embodiment of the invention, illustrated in the accompanying drawings.

In the drawings:

Fig. 1 is a vertical sectional yiew of the power applying mechanism.

Fig. 2 is a side elevation thereof.

Fig. 3 is a view, in perspective, of the dog used for holding the longitudinally movable member'in its raised position.

Fig. 4 is a sectional plan on lines 4-4: of Figs. 1 and 2. Fig. 5 is a sectional viewon line 5- of Fig. 4.

Fig". 6 is a partial sectional view on line 6-6 of Fig. 5, and I Fig. 7 is a fragmentary sectional plan of the teeth of the ratchet, this action more positive a spring the portion of the housing which supports the holding dog.

The power applying mechanism. consists of a hollow casing 14, formed with attache ing lugs or feet 15. Inside of the casing is disposed a hollow rack member 16 adapted to move between the ribs 16" and a spur gear 17, arranged between the rack member and one side of the casing. This side of 'the casing is formed with a rack, as shown at 18. The rack member 16 is hollow, and of a generally rectangular shape. It is formed on one side with a rack 19 adapted to engage with the teeth of the spur gear 17, and on the opposite side with ratchet teeth 20 which co-operate with a pawl or dog 21 to prevent the reverse movement-of the rack member. A groove or channel 24 runs practically the entire length. of the side of the rack member on the side having the ratchetteeth 20. This terminates at the point 25 forming a stop, and from there on the ratchet teeth extend across the entire face of the rack member. On the interior of the rack member 16 there are means consisting of two ribs 22 for engaging the T-headed portion 23 of the rod or longitudinally movable member 11. As shown in Fig. 4, the-ribs 22 are separated by a narrow space into which the T-head 23 may be inserted and secured in position by turning the same to engage the ribs 22. Power is applied to the rack barhandle 28, through the action of a pawl and ratchet mechanism, as shown in Figs. Sand 9. This consists of a ratchet 30, secured to or cast integrally with the square shank 27. The pawl 31 is pivoted to the hand lever at the point 32, and engages the teeth of the ratchet at the point 33. The opposite end of the pawl 31 is weighted, as at 34, so as to cause the-pawl always to engage with In order to make fastened to the pin 36, may be added to press the end 34 of the pawl, so as to cause it to engage the teeth of the ratchet.

The casing 14 is provided with a longitu-' dinal opening 37 through which the'square shank 27 passes for turning the spur gear 17. Adjacent this opening I provide a tripping surface 38, which as shown in Flg. 8 engages the r'earface of the'pawl 31' at the point 39. This is for the purpose of disengaging the pawl from the teeth of the ratchet when the rack bar is to be returned to its initial position.

The casin 14 is provided opposite the spur gear with a small housing 40 projecting therefrom for enclosing and supporting the'dog 21'.- The upper surface of the housing 4015 provided with a pair of perforated lugs 41 between which the tripping weight 42 is pivoted at the point 43. This'housing I is also provided with openings so thatthe tripping lug 44 and the finger 45 may engage the dog 21.

The dog is provided with a plurality of ratchet teeth 46 for engaging the ratchet teeth 20 of .the rack member. In order to make its operation more reliable, the finger ber, I provide a small projection 48 on the lower part of the dog, which projects through the lower part of the housing '40 and engages the lower edge of this housing at-the point 49. This construction also re vents lost motion resulting from the draggir'ig of the dog upwardly by the rack member. The dog pivots about a small rib 48 which seats in a transverse recess 49 in the housing 40.

As' previously stated, the rack member is caused to travel upwardly by the operation 'of-the hand lever 28 in rotating the spur gear 17; When the spur gear reaches the upper point of its travel at the point 50, the rack member, having traveled twice the dis-- tance, is at the upper portion 51 of the eas- 111% 14:. I

11. order to release the rack bar, it is necessary only to throw over the weight 42 so f as to cause the tripping lug 44 .to engage the luv 47 on the dog. I not refease the dog owing to the pull of the rack member upon the teeth. In order to release the do the handle 28 is turned suficiently to re ease the weight of the rack member upon the dog, the teeth of which then are forced away from the ratchet teeth on the rack member 16 by the lug 44. The handle is then released and the rack member falls. The reverse rotation of the hand le- This, in itself will.

This is necessary, of course,'in order to prevent the swinging of the-hand lever through a complete circle.

When the rack member 16 has descended sufficiently far, the upper portion 25 of the.

channel 24 strikes the lug 52 of the dog'21, and causes the same to oscillate sharply toward the rack'member. This results in the shifting of the weight 42 from the position -in which lug 44 engages lug 47 on the dog" to its operating position with the finger 45 engaging the dog 21. This action is caused by the impulse given to the weight through the tripping lug 44 by means of the lug 47.

Accordingly, when the rack has reached its lowermost position, the weight having been thrown over automatically, the dog is again in operative position to prevent a reverse movement of the rack member 16 when again raised. I

By means of the construction of the rack member wherein'the rod 11. is disposed. within the same and close to the rack surface '19, I eliminate a large portion of the friction caused by the eccentric attachment of the rod 11 to the mechanism. It will be seen that power is applied to the rack member 16 along the surface of the rack 19. The reacting force is along the center lipe of the rod 11. This causes a turning couple which tends, of course, to twist the rack member and cause the same to press along the grooves 53 on the interior of the casing 14, and increase the friction. By placing the rod "11 as closely as is practicable to the rack surface 19, Ireduce the turning couple and consequent friction to a minimum. 1

I claim:

1. A' lifting mechanism comprising a housing, a hollow ratchet bar having means on the interior thereof to which a rod may be attached, arranged within said housing r and adapted to move longitudinally thereof, said housing and ratchet bar formed on adjacent faces with rack surfaces, a spur gear interposed between said racks and engaging the same, means for rotating said gear to move said bar, and a pawl for preventing the return movement of said bar.

2. A lifting mechanism comprising a housing, a ratchet bar slidably arranged therein and having on one face thereof a. rack and on another face'a series of ratchet means operated by the contact of the stop at the end of said groove with the projection on said pawl for re-engaging said pawl with the ratchet bar on return of the bar to its initial position.

3. A lifting mechanism, comprising a housing, a ratchet bar slidably arranged therein and having on one face thereof a rack and on another face a series of ratchet teeth, a stop near the end of said bar, a dog for engaging said ratchet teeth to prevent reverse movement of said bar and having a member thereon adapted to engage said stop, a gear arranged in said housing and meshing with the rack on said bar, means for rotating said gear, means for disengaging said dog, and automatic means operated by the contact of said stop with the member on said dog for re-engaging said dog with the ratchet bar on return of the bar to its initial position.

4. A lifting mechanism comprising a housing, a ratchet bar slidably arranged therein and having on one face thereof a rack and on another face a series of ratchet teeth, a stop near the end of said bar, a dog for engaging said ratchet teeth to prevent reverse movement of said bar and having a member thereon adapted to engage said stop, a gear arranged in said housing and meshing with the rack on said bar, an operating handle having a pawl and ratchet thereon for rotating said gear, means for disengaging said dog, and automatic means operated by the contact of said stop with the member on said dog for re-engaging said dog with the ratchet bar on return of the bar to its initial position.

5. A lifting mechanism, comprising a housing having a rack on the interior thereof formed along one of its sides, a ratchet bar slidably arranged therein and having on one face thereof a rack and on another face aseries of ratchet teeth, a stop near the end of said bar, a dog for engaging said ratchet teeth to prevent reverse movement of said bar and having a member thereon adapted to engage said stop, a floating gear in said housing located between the two racks and meshing therewith, means for rotating said gear to set the-brakes, means for disengaging said dog, and automatic means operated by the contact of said stop with a member on said dog for re-engaging said dog with the ratchetbar on return of the bar to its initial position.

6. A lifting mechanism comprising a housing having an offset portion formed on one of its inner faces with a rack, and having adjacent thereto a slot, a hollow rack bar slidably mounted in said housing and having a rack on one side adjacent the rack in said offset portion and a series of ratchet teeth on another side, a pinion in said offset portion meshing with both racks, a handle having a shank thereon for rotating said pinion and engaging said pinion through said slot, and a dog supported by said housing and engaging said rack bar to prevent the reverse movement of said bar.

AUGUSTUS F. KLASING. 

